Carbureter for internal-combustion engines.



7 0 9 1 5 1 1 G .0 m T N E T A P GARB'URETBR FOR INTERNAL COMBUSTIONENGINES.

APPLIOATIOK FILED AUG. 25, 1905.

considerably, and to compensatefor this it has been v UNITED STATESPATENT OFFICE:

EDWARD V; HARTFORD, OF. NEW YORK, N. Y.

cannunn'mn son -m'rnmmn-oomsus'rron ENGINES.

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application at August 25,1905. seatin 275,788.

To'all whom it may concern: Be it known that I, Enwann V. HARTFORD, acitizen of the United States, residing in the city, county, and. Stateof New York, have invented certain new and usual to vary the secondaryair supply and automatic means have been provided for this purpose. 'Ihave found, however, that in a device of this type, especially when usedin connection with an engi'ne of high speed, the parts reciprocate sorapidly as to interfere with their proper positive action and l havethereforeprovided my moving parts with a device for controlling themovement and insuring their positive and effective operation.

In the drawings illustrating one form of my invention Figure l is anelevation of my carbureter in section, showing the parts in their normalposition. Fig. 2 is a detailed section of a modified form of valvecontrolling device.'

In the construction shown in Fig. l the numeral 1 indicates the shell orcase of the mixing chamber; 2 the supply' pipe for the hydro-carbonmixture and 3 the outlet leading to the engine. The casing 1ispreferably cylindrical and entirely closed except at the bottom whereit is supplied with a series ofperforations 4, as shown. 'Within thesaid shell is located an annular valve .5, upon which is fitted a spider6, secured to the stem 7. The valve 5 isfof sufficient area to cover-tl1e openings 4 when the valve is in the position shown,

and it is retained in this position by a spring 8 on the stem 7,operating against the upper portion of the case and the spider. Theupper end of the shaft 7 .passes through a stuffing box at 9 at the.upper end of the case I l l is created in the cylinder and,communicating with the mixing chamber of the carburetendra'ws a charge Iinto the engine. This vacuum, however, lifts the valve 5 against theoperation of the spring and admits the proper amount of air through theapertures 4, the hydro-carbon mixture being fed through the pipe 2 inthe usual manner. As the speed of the engine increases the vacuumcreated by its up-stroke becomes greater and this serves to lift thevalve high-er and thusladniits a correspondingly larger proportion ofair intorthe chamber. At highspeed the vibration of the valve and rodwill be found to be so rapid as to prevent its complete response to themovements desired, bu t loy means of the frictional retarding meansshown, ;i; his

excessive vibration -is completely controlled and the parts caused torespond in strict accordance'with the desired operation. The supply ofhydro-carbon mix- -ture may be regulated by a suitable plug in he feedof a carburetor. A dash-pot, however, is not thbroughly effective forthe purpose, as it does not act properly under all conditions. Forinstance, when the engine is running at high speed and the strokes arequick and hard, a dash-pot offers an almost unyielding resistance to themovement of the valve. That is to say, a quick, upward impetus to thecarburetor valve would be checked by a dash-pot, whereas a slow, gentlemovement would be permitted. The frictional means or devices which Iemploy are not affected by fluid compression and expansion, such asaffects the action of a dash-pot, and my device, therefore, acts withthe same'resistance under rapid movements as under slow movements. 1 amaware that an accidental and innnaterialamount of friction occursbetween the piston and cylinder of a dah-pot or similar device, but'thisfriction is modified and almost entirely overcome by the c mpression andexpansion of fluid on opposite sides of the piston in the dash-pot. Mydevice provides pure friction which is not affected by other conditions,such as the compression of air and the like, and by the expressionsfrictional means or frictional devices in the claims, 1 desire to limitmyself to means or devices for producing pure, intentional friction, notaffected by fluid cola? pression or expansion.

It is obvious that many modifications and changes may be made from theexact constructions shown and described, without departing from thespirit of my invention, and I do not intend to limit myself to thespecific form shown, but

Whr'tt I claim and desire to secure by Letters Patent 1. A carlmre terhaving a valve and automatic and frlc-. tional means for regulating theaction of the valve.

